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Now there are two types of benchmarks:
1. official benchmarks: benchmarks defined in tools/perf/benchmarks.
  -- These are officially supported and we will keep them working.
  -- They also are the only ones scheduled on main chrome.perf waterfall.
2. contrib benchmarks: benchmarks defined in tools/perf/contrib.
  -- We don't run these on our own bots (except in rare circumstances)
  -- We maintain the right to break these when necessary to move the
     framework forward.

"all benchmarks" now means "official benchmarks" + "contrib benchmarks".

Also remove the word "all" in places where it is redundant/confusing.

This changelist prepares the ground for the changes for issue 961830.

TBR: jbudorick@chromium.org
Bug: 961830
Change-Id: I9985cd75814b284fc3b748597ce6724f9a53068a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1606223
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659190}